MT6601 – MICROCONTROLLER AND PLC IMPORTANT QUESTIONS

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DEPARTMENT OF MECHATRONICS ENGINEERING
MT6601 – MICROCONTROLLER AND PLC
IMPORTANT QUESTIONS
PART A
  1.     List some special function register of 8051.               
  2. What are the flags supported by 8051 controller?
  1. State the function of RS1 and RS0 bits in the flag register of 8051.
4.      How we can change level and edge triggering characteristics of 8051 external interrupts?
5.      How baud rate will be calculated in mode1 and mode 
 6.    Define  two-key Roll over.
             7.      What is latch? Where it is used?
             8.      What do you mean by ladder logic?
             9.      List down the types of buses required in a PLC.
10.  Write a simple ladder logic program for stair case switch.
1           1.  Write the difference between microcontroller and microprocessor.
            12.  What is the significance of EA pin?
             13.  What are the alternate uses of port 3 pins?
             14.  Give the PSW setting for making register bank 2 as default register bank in 8051 microcontroller.
  15.  Write down the function of the SP in 8051.
16.  What is the significance of DPTR?
17.  State the function of RS1 and RS0 bits in the flag register of 8051.
18.  Write a program to subtract the contents of R1 of bank 0 from the contents of R0 of bank 2.
19.  Explain the contents of the accumulator after the execution of the following segments.
MOV A, #03 H
MOV R4, #04H
ADD A, R4
20.  Justify why the crystal oscillator frequency in 8051 is chosen as          11.0592 MHz.
21.  State the function of RS1 and RS0 bits in the flag register of 8051.
22.  Define the term multiple interrupts.
23.  Draw the format of SCON register.
24.  What is baud rate?
25.  What are the different types of ADC?
26.  List out the features of programmable logic controller.
27.  What are the functions of internal relays?
28.  What do you mean by ladder logic?
29.  Define latch.Where it is used?
30.  State proximity switch.

 PART B                                           
1.       Draw and explain the architecture of 8051 microcontroller.
2.      Explain the different serial communication modes in 8051.
3.       i) Write a program in 8051 to transfer letter “A” serially at 4800 baud rate continuously.                                                                                                                7
 ii) Write assembly language program to perform block data transfer from external RAM to internal RAM. Assume array has 5 elements starting from location 0500h.   6
4.      Write an 8051 ALP to generate a square wave with an ON time of 3 ms and an OFF time of 10 ms on all pins of port 0. Assume an XTAL of 22 MHz
5.      Explain with suitable program the LCD is interfaced with 8051.
6.      What are the modes of serial communication in 8051? Explain in detail about setting up the serial port modes.
7.      Describe the parts of PLCs and explain how the PLCs are programmed.   
8.      Explain the different timer function of PLC with an example.
9.      Describe the applications of PLC in automatic control of warehouse door with ladder logic.
10.  Describe the applications of PLC in automatic car washing machine with ladder logic.    
11.  Write a suitable program to find largest number in an Array.
12.  Write a ladder logic program for Starting 3 Motors Sequentially with delay.       (i.e) starting the oil pump motor immediately when START is pressed. The main motor will be started after a 10 sec delay and then the auxiliary motor after a 5 sec delay. In addition, stopping all motors immediately when STOP is pressed.
13.  Draw the functional block diagram of 8051 microcontroller and explain in detail.
14.  Explain about assembly language programming tool used for 8051.
15.  Describe a Special function registers used in 8051 with example.
16.  With suitable examples explain the addressing modes of 8051 microcontroller.
17.  Explain in detail instruction sets available in 8051 microcontroller with example.
18.  Write a suitable program to convert packed BCD to two ASCII number and place in R2 and R6 register.
19.  Write a program to find the largest number in an array.                              
20.  Write an 8051 assembly language program to exchange data block to other memory block.
21.  Write an ALP to generate a square wave of frequency 10Hz using Timer0 Mode1, assume clock frequency 12 MHz.
22.  Write an assembly language program to perform 8 bit BCD addition. Assume operands are in the memory location 4500H and 4501H.
23.  Explain the different types of serial communication modes in 8051.
24.  Write an assembly language program to generate a square wave of 50% duty cycle (with equal portions high and low) on P1.5 bit. Use timer 0 to generate the time delay.
25.  Explain with neat diagram the interfacing of 8051 microcontroller with keyboard.           
26.  What are the modes of serial communication in 8051? Explain in detail about setting up the serial port modes.
27.  Explain in detail how digital to analog interface can be done in 8051 microcontroller.
28.  With suitable program how LCD is interfaced with 8051.
29.  Discuss about ADC interfacing with 8051. Also illustrate the chip details of ADC.
30.  With neat sketch explain the architecture of PLC.
31.  Explain the different timer function of PLC with an example.                   
32.  Illustrate the working of Electromagnetic latching relays with necessary sketch.
33.  Develop the PLC ladder diagram to control the level of water in a storage tank.
34.  Explain briefly about instruction set of programmable logic controller.
35.  How the hardware circuit interfaces with a microcontroller? Give an example.
36.Develop the PLC program to implement an automatic car washing system.

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